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Re: High latencies writing to a memory mapped file

To: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Subject: Re: High latencies writing to a memory mapped file
From: Matthias Schniedermeyer <ms@xxxxxxx>
Date: Tue, 27 Jul 2010 13:27:00 +0200
Cc: Shawn Bohrer <shawn.bohrer@xxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20100727124750.30bb3209@xxxxxxxxxxxxxxxxxxxx>
References: <20100722144706.GA2840@xxxxxxxxxxxxxxxxxxxxxxxxx> <20100727092452.GA23307@xxxxxxx> <20100727124750.30bb3209@xxxxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.19 (2009-01-05)
On 27.07.2010 12:47, Emmanuel Florac wrote:
> Le Tue, 27 Jul 2010 11:24:52 +0200
> Matthias Schniedermeyer <ms@xxxxxxx> écrivait:
> > In case anybody has an idea what i could do to identify and/or
> > isolate the root-cause, i'm open for suggestions.
> > 
> I'd thought that the io scheduler is the culprit. I've generally found
> that the default CFQ scheduler (default) is terrible for file servers.

I have 'deadline'ed the server, if that is the culprit then i will 
"know" in about a month. (As i don't know how to force the problem i can 
only wait for the problem not to happen. :-| )

Bis denn

Real Programmers consider "what you see is what you get" to be just as 
bad a concept in Text Editors as it is in women. No, the Real Programmer
wants a "you asked for it, you got it" text editor -- complicated, 
cryptic, powerful, unforgiving, dangerous.

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